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#Struts #Servlet #Web #JSP #正则表达式

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本文介绍了一个简单的用户注册与登录系统的实现过程，包括用户注册时的密码MD5加密、邮箱验证等功能，以及利用Struts2框架进行界面展示和交互。

实现用户注册与登陆模块

注册界面:

登陆界面:

一、定义UserService其它接口并将其实现

/**
	 * 用户注册
	 * @param user
	 */
	public void register(User user);
	/**
	 * 判断用户是否存在
	 * @param username
	 * @return
	 */
	public boolean exsit(String username);
	/**
	 * 判断用户名及密码是否通过
	 * @param username
	 * @param password
	 * @return
	 */
	public boolean validate(String username,String password);
	/**
	 * 更新密码
	 * @param username 用户名
	 * @param newpassword 新密码
	 */
	public void updatePassword(String username, String newpassword);
	
	/**
	 * 判断邮箱是否已注册
	 * @param email
	 * @return
	 */
	public boolean exsitEmail(String email);
	/**
	 * 更新注册邮箱
	 * @param username
	 * @param newemail
	 */
	public void updateEmail(String username,String newemail);

实现类:

@Service("userServiceBean")
public class UserServiceBean extends DaoSupport<User> implements UserService {
	
	@Resource(name="userRoleServiceBean")
	private UserRoleService userRoleService;
	
	public void updateEmail(String username,String newemail){
		em.createQuery("update User o set o.email=?1 where o.username=?2")
		.setParameter(1, newemail).setParameter(2, username).executeUpdate();
	}
	public void updatePassword(String username, String newpassword){
		em.createQuery("update User o set o.password=?1 where o.username=?2")
		.setParameter(1, MD5.MD5Encode(newpassword)).setParameter(2, username).executeUpdate();
	}
	public void register(User user){
		//对密码进行md5加密
		user.setUserrole(userRoleService.getReference("user"));
		UserGrade userGrade = new UserGrade();
		user.setUsergrade(userGrade);
		UserInfo userInfo = new UserInfo();
		userInfo.setNickname(user.getUsername());
		user.setUserinfo(userInfo);
		user.setPassword(MD5.MD5Encode(user.getPassword()));
		super.save(user);
	}
	@Transactional(propagation=Propagation.NOT_SUPPORTED)
	public boolean exsitEmail(String email){
		long count = (Long)em.createQuery("select count(o) from User o where o.email=?1")
		.setParameter(1, email).getSingleResult();
		return count>0;
	}
	@Transactional(propagation=Propagation.NOT_SUPPORTED)
	public boolean exsit(String username){
		long count = (Long)em.createQuery("select count(o) from User o where o.username=?1")
		.setParameter(1, username).getSingleResult();
		return count>0;
	}
	@Transactional(propagation=Propagation.NOT_SUPPORTED)
	public boolean validate(String username,String password){
		long count = (Long)em.createQuery("select count(o) from User o where o.username=?1 and o.password=?2")
		.setParameter(1, username).setParameter(2, MD5.MD5Encode(password)).getSingleResult();
		return count>0;
	}
}

知识提示: 注册的同时需对密码进行md5加密

二、UserRegAction类的实现

@Controller("userRegAction") @Scope("prototype")
public class UserRegAction extends ActionSupport{
	
	private static final long serialVersionUID = 1159518406043666180L;
	private User user;
	private String repassword;
	private String code;
	@Resource(name="userServiceBean")
	private UserService userService;
	public String getRepassword() {
		return repassword;
	}
	public void setRepassword(String repassword) {
		this.repassword = repassword;
	}
	public String getCode() {
		return code;
	}
	public void setCode(String code) {
		this.code = code;
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
	/**
	 * 打开用户注册界面 
	 * @return
	 * @throws Exception
	 */
	public String registerUI()throws Exception{	
		return Action.SUCCESS;
	}
	/**
	 * 用户注册
	 * @return
	 * @throws Exception
	 */
	public String register() throws Exception {
		String validateCode = (String)ActionContext.getContext().getSession().get("validateCode");
		if(!validateCode.equals(this.getCode())){
			this.addFieldError("codeerror","验证码有误!");
			return Action.INPUT;
		}
		//判断用户是否存在
		if(userService.exsit(user.getUsername().trim())){
			this.addFieldError("user.username", "用户名已存在!");
			return Action.INPUT;
		}
		//判断邮箱是否已初注册过
		if(userService.exsitEmail(user.getEmail().trim())){
			this.addFieldError("user.email", "邮箱已被注册过!");
			return Action.INPUT;
		}
		userService.register(user);
		return Action.SUCCESS;
	}
}

基于xml的数据验证,文件跟action在同一个目录下,并命名为:UserRegAction-register-validation.xml,register是action名.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.3//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd"> 
<validators>
    <field name="user.username">
        <field-validator type="requiredstring">
        	<!-- 默认为true -->
            <param name="trim">true</param>
            <message>用户名不能为空!</message>
        </field-validator>
        <field-validator type="stringlength">   
        	<param name="maxLength">15</param>
        	<param name="minLength">6</param>
        	<!-- 给用户显示的提示信息,可以国际化 -->
            <message>用户名长度在${minLength}~${maxLength}之间!</message>
        </field-validator>
    </field>
    <field name="user.password">
        <field-validator type="requiredstring">
        	<!-- 默认为true -->
            <param name="trim">true</param>
            <message>密码不能为空!</message>
        </field-validator>
        <field-validator type="stringlength">
        	<param name="maxLength">15</param>
        	<param name="minLength">6</param>
        	<!-- 给用户显示的提示信息,可以国际化 -->
            <message>密码长度在${minLength}~${maxLength}之间!</message>
        </field-validator>
    </field>
    <field name="repassword">
        <field-validator type="requiredstring">
        	<!-- 默认为true -->
            <param name="trim">true</param>
            <message>重复密码不能为空!</message>
        </field-validator>
         <field-validator type="fieldexpression">
        	<param name="expression"><![CDATA[repassword.equals(user.password)]]></param>
            <message>密码输入不一致!</message>
        </field-validator>
    </field>
    <field name="user.email">
        <field-validator type="requiredstring">
            <message>电子邮箱不能为空!</message>
        </field-validator>
		<field-validator type="email">
		     <message>电子邮箱格式不正确!</message>
		</field-validator>
    </field>
</validators>

知识提示: 这个配置文件支持正则表达式(如:${minLength})和ognl表达式(如:repassword.equals(user.password))

2.2 配置struts-user.xml文件:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="forward" namespace="/" extends="struts-default">
	<!-- 用户注册界面 -->
	<action name="registerUI" class="userRegAction" method="registerUI">
		<result>/WEB-INF/forward/register.jsp</result>
	</action>
	<!-- 用户注册 -->
	<action name="register" class="userRegAction" method="register">
		<result name="input">/WEB-INF/forward/register.jsp</result>
		<result name="success">/WEB-INF/forward/register_comp.jsp</result>
	</action>
	<!-- 用户登陆界面 -->
	<action name="loginUI" class="userLoginAction" method="loginUI">
		<result name="success">/WEB-INF/forward/login.jsp</result>    
	</action>
	<!-- 用户登陆 -->
	<action name="login" class="userLoginAction" method="login">
		<result name="input">/WEB-INF/forward/login.jsp</result>
		<result name="success" type="redirectAction">index</result>
	</action>
	<!-- 判断用户或邮箱是否被注册过 -->
	<action name="*_Exist" class="usernameOrEmailExistAction" method="{1}">
	</action>
	<!-- 前台主页 -->
	<action name="index">
		<result>/WEB-INF/forward/index.jsp</result>
	</action>
</package> 
</struts>

2.3 验证码Servlet: VerifyCodeServlet,这个验证的实现也不是很好! 大家有没有更好的实现.在web.xml文件配置:

 <!-- 验证码 -->
   <servlet>
		<servlet-name>VerifyCodeServlet</servlet-name>
		<servlet-class>cn.daxia.web.servlet.verify.VerifyCodeServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>VerifyCodeServlet</servlet-name>
		<url-pattern>/verifyCodeServlet</url-pattern>
	</servlet-mapping>

2.4 设置basePath: 写一个filter-->MyPrepareAndExecuteFilter,继承StrutsPrepareAndExecuteFilter,重新配置web.xml文件

public class MyPrepareAndExecuteFilter extends StrutsPrepareAndExecuteFilter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		super.init(filterConfig);
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		//转换成HttpServletRequest
		HttpServletRequest request = (HttpServletRequest)req;
		ServletContext context = request.getSession().getServletContext();
		if(context.getAttribute("basePath")==null){
			String path = request.getContextPath();
			String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
			context.setAttribute("basePath", basePath);
		}		
		super.doFilter(req, res, chain);  
	}
}

改写filter,此解决方案个人觉得不是很好,大家有没有其他方案

 <filter>
        <filter-name>struts2</filter-name>
        <filter-class>cn.daxia.web.filter.MyPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
   </filter-mapping>

2.5 用户注册js验证文件在/js/user/register.js,验证用户或邮箱是否存在用了ajax实现,使用的js库是jquery1.3,js代码没有重构,比较乱

function ajaxUserNameSumbit(url,post){
   	$.ajax({
  	 type: "post",   
 	 url: url,
  	 data: post,
  	 success: function(msg){
  	 		if(msg=='notexist'){
  	 			document.forms[0].uservalidate.value='true';
  	 			$("#usermsg").css("display","inline").html("<div class='rightSign'></div><font color='green'>您可以使用该用户名！</font>").fadeIn("slow");
  	 		}else{
  	 			document.forms[0].uservalidate.value='false';
  	 			$("#usermsg").css("display","inline").html("<div class='errorSign'></div><font color='red'>此用户名已被使用！</font>").fadeIn("slow");;
  	 		}
  	 		
  	      }
	}); 
}

三、用户登陆部分大家不访自己去实现一下